From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7E8D11B87C0; Thu, 1 Jan 2026 01:27:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767230837; cv=none; b=GFLCqmsEYmXYqv9xHZpDKdYP8MV5iM/vblxlyKirdJm+D5e+Mr6cVmuzYGk+JXZrwYVXr/+K6rITmHWjmqXJwZQAM8ccNa7PEbrrt9V5k4p+6sHiEea9Rp/iXyISKuvLrl6QA+yDShVXwyAEZnvzQSXYqamuW/9dQIWxe7Nb8cI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767230837; c=relaxed/simple; bh=kfzq7OmA115iWgJ760zWgcONuzBXEf0EdKCppmYMA+4=; h=Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References: Mime-Version:Content-Type; b=tQkeDQ/atDB1qTTIpV00+zg/EQiYYi3U6y4Ol2wNCm5CTCcr60ZJCX6Ccc1soj38KACxQXQIkj+bksBo3leFRMkzOx1MpTYq70QEkCbIeoLvFv7oTeIDtreYMQ0SOVTVdne2uQ5KV3DLxg4ENWEPYfq9LVzACtgraVi15nbaiNU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b=go9XllSI; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux-foundation.org header.i=@linux-foundation.org header.b="go9XllSI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CF7ACC113D0; Thu, 1 Jan 2026 01:27:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1767230836; bh=kfzq7OmA115iWgJ760zWgcONuzBXEf0EdKCppmYMA+4=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=go9XllSISBYzAOyojV4kRDLc0Hnz1rcUEPO57TcB9+qJSNx41b/AgCw3COmwnxqiT j7mZyPb6MMMoWfBvYMRKbnSkqA9aNlPjK8qN3O6fQrDlWlCfoS7A/tERDwbL0qwoSr LfQqAcLLX+Rrl87zP58OiVxJMBgmW31R6wiBayKc= Date: Wed, 31 Dec 2025 17:27:14 -0800 From: Andrew Morton To: Mike Rapoport Cc: Alex Shi , Alexander Gordeev , Andreas Larsson , Borislav Petkov , Brian Cain , "Christophe Leroy (CS GROUP)" , Catalin Marinas , "David S. Miller" , Dave Hansen , David Hildenbrand , Dinh Nguyen , Geert Uytterhoeven , Guo Ren , Heiko Carstens , Helge Deller , Huacai Chen , Ingo Molnar , Johannes Berg , John Paul Adrian Glaubitz , Jonathan Corbet , "Liam R. Howlett" , Lorenzo Stoakes , Magnus Lindholm , Matt Turner , Max Filippov , Michael Ellerman , Michal Hocko , Michal Simek , Muchun Song , Oscar Salvador , Palmer Dabbelt , Pratyush Yadav , Richard Weinberger , Russell King , Stafford Horne , Suren Baghdasaryan , Thomas Bogendoerfer , Thomas Gleixner , Vasily Gorbik , Vineet Gupta , Vlastimil Babka , Will Deacon , x86@kernel.org, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-cxl@vger.kernel.org, linux-doc@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-kernel@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-openrisc@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-um@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, sparclinux@vger.kernel.org Subject: Re: [PATCH 00/28] arch, mm: consolidate hugetlb early reservation Message-Id: <20251231172714.a7fe44e856c14fdc8fe1cb43@linux-foundation.org> In-Reply-To: <20251228124001.3624742-1-rppt@kernel.org> References: <20251228124001.3624742-1-rppt@kernel.org> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-hexagon@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Sun, 28 Dec 2025 14:39:30 +0200 Mike Rapoport wrote: > Order in which early memory reservation for hugetlb happens depends on > architecture, on configuration options and on command line parameters. > > Some architectures rely on the core MM to call hugetlb_bootmem_alloc() > while others call it very early to allow pre-allocation of HVO-style > vmemmap. > > When hugetlb_cma is supported by an architecture it is initialized during > setup_arch() and then later hugetlb_init code needs to understand did it > happen or not. > > To make everything consistent and unified, both reservation of hugetlb > memory from bootmem and creation of CMA areas for hugetlb must be called > from core MM initialization and it would have been a simple change. > However, HVO-style pre-initialization ordering requirements slightly > complicate things and for HVO pre-init to work sparse and memory map should > be initialized after hugetlb reservations. > > This required pulling out the call to free_area_init() out of setup_arch() > path and moving it MM initialization and this is what the first 23 patches > do. > > These changes are deliberately split into per-arch patches that change how > the zone limits are calculated for each architecture and the patches 22 and > 23 just remove the calls to free_area_init() and sprase_init() from arch/*. > > Patch 24 is a simple cleanup for MIPS. > > Patches 25 and 26 actually consolidate hugetlb reservations and patches 27 > and 28 perform some aftermath cleanups. Thanks for the diligence - this can't have been the most exciting thing to work on! > I tried to trim the distribution list and although it's still quite long > if you feel that someone was wrongly excluded please add them back. I'll add these to mm.git's mm-new branch for some testing. I'll suppress the usual email storm because 41 * 28 is a lot of emails ;)